Re: [Qemu-devel] [PATCH 00/14] softfloat: Use POSIX integer types - benchmarked

[Peter Maydell]

On 16 January 2012 00:46, Andreas Färber <address@hidden> wrote:
> For a loop count of 100,000 and 5 runs I got the following results:
>
>  current:        138.9-204.1 Whetstone-MIPS
>  [u]int*_t:      185.2-188.7 Whetstone-MIPS
>  [u]int_fast*_t: 285.7-294.1 Whetstone-MIPS
>
>  Toshiba AC100:  833.3-909.1 Whetstone-MIPS
>
> These results seem to indicate that the "fast" POSIX types are indeed
> somewhat faster, both compared to exact-size POSIX types and to the
> current state.

OTOH I did a run of scimark2 and got:
current tree:
**                                                              **
** SciMark2 Numeric Benchmark, see http://math.nist.gov/scimark **
** for details. (Results can be submitted to address@hidden)     **
**                                                              **
Using       2.00 seconds min time per kenel.
Composite Score:           12.98
FFT             Mflops:     7.66    (N=1024)
SOR             Mflops:    19.49    (100 x 100)
MonteCarlo:     Mflops:     6.12
Sparse matmult  Mflops:    15.34    (N=1000, nz=5000)
LU              Mflops:    16.28    (M=100, N=100)

with patches (yours and mine):
**                                                              **
** SciMark2 Numeric Benchmark, see http://math.nist.gov/scimark **
** for details. (Results can be submitted to address@hidden)     **
**                                                              **
Using       2.00 seconds min time per kenel.
Composite Score:           11.87
FFT             Mflops:     7.12    (N=1024)
SOR             Mflops:    17.66    (100 x 100)
MonteCarlo:     Mflops:     5.75
Sparse matmult  Mflops:    14.03    (N=1000, nz=5000)
LU              Mflops:    14.81    (M=100, N=100)

Hmmm...

-- PMM